What was found
IND-PHX - FLT 656 - DURING CLIMB AT 4,000 FEET, THE AFT CARGO DOOR OPEN LIGHT ILLUMINATED. AC EXPERIENCED NO PRESSURIZATION PROBLEMS AND RETURNED TO IND, LANDING WITHOUT INCIDENT. NO OVERWEIGHT LANDING REQUIRED. CONTRACT MX UNABLE TO DUPLICATE PROBLEM, INSPECTION REVEALED NO DEFECTS. MX CONTROL ISSUED UNMANNED STATION RELEASE. PHX MX FOUND NOTHING WRONG WITH DOOR OR POSITION SENSING. DOOR OPERATED MANY TIMES ON INSIDE AND OUT WITHOUT PROBLEMS. BAG FOUND IN WAY WHEN DOOR WAS FIRST OPENED. CLEARED MEL 52-03 CONTROL NR 18637. AC RETURNED TO SERVICE. (Z)